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Installed Hayden Transmission Cooler

CapitalTruck

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CapitalTruck Senior Enthusiast

CapitalTruck

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So, I might be the only one on this board that didn't have the trailer package on their truck when they got it. I really wanted to get a tranny cooler put on. On my GMT-800 I got the GM Accessories package which included the OEM tranny cooler and OEM lines. You had to replace the line that ran from the cooler to the transmission. This was a royal pain. Plus, the damn things have a limited service life as they started leaking after some years. With this in mind, and the fact that the install procedures for the OEM tranny lines on the GMT-900 included bumper removal (for the line that runs from the cooler to the transmission), I decided to go aftermarket. The Hayden 677 plate cooler fit with room to spare. By drilling a couple of holes in the mounting plate of the cooler I was able to bolt it in front of the AC condenser without a problem. I didn't want to use those stupid zip strips with which you mount the cooler directly to the fins of the radiator/condenser.

 

I purchased two of the Hayden 106 transmission fluid lines (made by Gates), which you will need if you install one of these as the hose which comes with the cooler is too short and too narrow. Also, the Hayden 397 cooler fitting adaptor works perfectly to plumb the cooler into the radiator.

 

Basically, if your truck doesn't have a tranny cooler it is no problem at all to install this. Took me about an hour. Make sure you pick up two of the 106 lines and the 397 adaptor and you'll be good. You'll need a couple of 1/4 inch bolts from a hardware store to securely mount the cooler itself. After all was said and done I had to add just shy of another quart of fluid to the tranny to account for the additional lines/cooler.

 

I figure if I have to replace the Hayden lines after a period of time I'm still no worse off than the OEMs which tend to leak anyway.

 

All was purchased on amazon.com

 

Already transmission fluid temps are running cooler in summer city stop and go traffic.

CapitalTruck Senior Enthusiast

CapitalTruck

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When purchasing I noted that the 677 was still larger than the OEM external cooler on both the GMT-900 and GMT-800 trucks. I didn't want to take up too much space in front of the A/C condenser. In the Hayden catalog the 677 was listed as the middle of the line up. Now as I look at things though, I might swap up to the larger one!

XYZ Enthusiast

XYZ

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No trans cooler here but once I put one in it made a world of difference.

I was running a large TCI cooler last year, it would eventually get into the low 180s temp-wise in August as the days went on. So far this year, the Tru-Cool, while driving, has only hit 158 degrees F...if you sit for a while, it creeps up, but drops back down once you start moving again. This is in South Texas heat-humidity, and as August approaches, that will be the true test.

BruceDeuce Enthusiast

BruceDeuce

Posted
Posted

I was running a large TCI cooler last year, it would eventually get into the low 180s temp-wise in August as the days went on. So far this year, the Tru-Cool, while driving, has only hit 158 degrees F...if you sit for a while, it creeps up, but drops back down once you start moving again. This is in South Texas heat-humidity, and as August approaches, that will be the true test.

Its been upper 90s here for a month with high humidity and without towing Im at 155 all day no matter how hard I run it.

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